Gerald Ford presided over the United States’ 1976 Bicentennial celebrations.
Ford became president in 1974 after serving as vice president under the Twenty-Fifth Amendment. He was president when the national observances culminated on July 4, 1976, the 200th anniversary of the adoption of the Declaration of Independence.
During the anniversary year, Ford attended major events in places associated with the American Revolution, including Valley Forge, New York Harbor, and Philadelphia. He also participated in ceremonies involving Operation Sail, the international fleet gathering held in New York.
Jimmy Carter was elected president in November 1976, but he did not preside over the main July Bicentennial celebrations. Richard Nixon had resigned before the anniversary, and Ronald Reagan was not yet president. This timing makes Ford the specific presidential answer.